Heavy metal-containing dyestuffs



Un cd St s Pa e HEAVY METAL-CONTAININ G DYESTUFFS Walter Biedermann, Fabio Bella, and Guido Schetty, Basel, Switzerland, assignors to J. R. Geigy A.-G., Basel, Switzerland, a Swiss firm No Drawing. pplication January 21, 1958 Serial No. 710,176

Claims priority, application Switzerland January 26, 1956 6 Claims. (Cl. 260-445) The invention concerns heavy metal-containing azo dyestufis which contain a mono and a disazo dyestufi bound to co-ordinative hexavalent chromium. It also con cerns processes for the production of such dyestufis and their use for the dyeing of material containing protein such as leather, silk, wool, furs, as well as of synthetic polypeptide fibres such as Lanital, superpolyamide and superpolyurethane fibres.

it been found that very valuable heavy-metal containing dyestuffs are obtained if a dicyclically co-ordinated, metal-containing azo dyestuff in which each dyestufl molecule is bound to co-ordinative hexavalent chromium, is added in a weakly acid, neutral or alkaline medium to a dicyclic metallising azo dyestuflf, these azo dyestuds being so chosen that the reaction product contains an unsulphonated monazo and a sulphonated disazo dyestufi each of the kind defined below bound in complex linkage to one and the same chromium atom.

The o.o-dihydroxy azo dyestuiis are the preferred dicyclic metallising azo dyestufis of our invention. However, also such o-hydroxy azo dyestuffs which contain in the o-position a substituent which can be exchanged for the hydroxyl group or which can be converted into the hydroxyl group can be used in the production of the metalcontaining dyestufis used according to the present invention which contain a co-ordinative hexavalent chromium atom for each dyestuii molecule. Examples of such dyemetallised preferably in aqueous solution, the unsulphonated metallisable dyestuiis in higher boiling alcohols such as, e.g. ethylene glycol and monalkyl esters thereof at temperatures of from 9G-l50 C. Depending on the method of production andthe reaction medium, the so- 2,933,489 Patented Apr. 1 -9 such as occurs for example in the salicylato or tartrato compounds of metal-containing monazo dyestuffs containing one chromium atom to each dyestutl molecule.

In the present process the coupling products of diazotised 4-nitro-2-arnino-1-hydroxybenzene compounds which may be further substituted in 6-position by halogen, lower alkyl, nitro or acylarnino. groups with hydroxynaphtha- 'lene compounds coupling in o-position to a hydroxyl group, are used as monoazo dyestuiis. Examples of useful disazo dyestufis are the compounds formed from a diazotised S-sulphophenylazo 4 methyl-Z-amino-l-hydroxybenzene and naphthols coupling in o-position to a hydroxyl group. The naphthalene rings in the mono and disazo dyestufis and the sulphophenyl radical of the disazo dyestufi can contain the substituents usual in azo dyestutis, for example halogen, alkyl, alkoxy, nitro, acylamino, sulphonic acid amide, alkyl sulphonyl, aryl sulphony-l, acyl substituents. Z-hydroxynaphthalene is however the preferred coupling or end component of the monoazo as well as of the disazo dyestufi. It is advan tageous if only one sulphonic acid group is present in the' co-ordinated disazo dyestutf.

The metal-free azo dyestufi may be added to the metal containing azo dyestuii in Water or in a water-containing of corresponding lithium, potassium or ammonium com;

pounds. Low alcohols such as ethyl alcohol, ethylene glycol, ethylene glycol monomethyl or monoethyl others and amides of lower fatty acids such as formamide, dimethyl formamide, may be used as organic solvents. Under favourable conditions, the metal-free azo dyestuif is incorporated relatively quickly and completely.

It has further been found that with the instant selection of metallisable monoazo and disazo dyes it. is not absolutely necessary to first manufacture in a separate process a so-called 1:1 chromium complex of one of the metallisable dyes and then to incorporate in a next step under:

favourable conditions the other metallisable dyestuff. It

has been found that the desired product is predominantly formed and may easily be separated from undesired byproducts if a so-called mix-metallisation is performed,

I e.g. if a mixture of substantially equivalent amounts of a called 1:1 complex ofa metallisable azo dyestuff, containing a chromium atom for each dyestufi molecule which shall be added to the metal-free azo dyestuli, can contain still further atoms or groups attached at the heavy metal atom. For example, aquo, acido, hydroxo complexes of the metal-containing dyestutfs can be formed and used. The 1:1 complex can even contain chelated attached atoms or groups which can be displaced by the dicyclically chelating second azo dyestuff,

metallisable sulphonated disazo dye and of a metallisable unsulphonated monoazo dye of the kind defined above is treated in water with substantially and equivalent amount of an appropriate agent giving ofi chromium. Without the intention of being fixed to any theory or even most probable explanation, we suppose that due to the different solubility in Water and perhaps also to a difierent complex stability of the dyes used, a so-called 1:1 chromium complex is first formed, which, for example with an alkali metal or ammonium salt of disalicylato chromic acid as the metallising agent, will probably contain a colourless group attached to the chromium atom, viz. a salicyclic acid molecule.

This 1:1 complex forms a 2:1 complex with the other metal-free and sparingly soluble metallisable dyestufi. The desired metal-containing dyestufis can be obtained from the aqueous solution by salting out and from an alcoholic solution by precipitation with water or by distilling oil the organic solvent. The process according to the present invention enables deep greenish-black metalcontaining dyestufis to be produced; up to now such shades could only be obtained with difiiculty from monoazo dyestuffs. In addition it is alsotparticulariy advantageous that sulphonated heavy metal-containing textile dyestuffs can be produced which are distinguished by good neutral drawing power on to wool, very good wet fastness and especially a good fastness to acid milling of the wool dyeings, interesting deep shades and relatively 'very good fastness to light.

The a new chromium-containing azo dyestuffs, which contain one sulphonic acid. group in the form of thelithium, sodium, potassium, rubidium, caesium or ammonium salt, correspond to the general Formula I X represents hydrogen; halogen and if so preferably chlorine; lower allyl and if so preferably methyl; acylamino and if so preferably acetylamino; 'or nitro; Y represents hydrogen; or halogen, if so preferably chlo- ,rine; or lower alkyl and if so preferably methyl; lower alkoxy; or acylarnino; n represents 1 or 2.

The water soluble textile dyestufis according to the present invention which contain only one sulphonic acid group which confers a sufi'icient water solubility, are suitable not only for the dyeing of wool from a weakly alkaline, neutral to weakly acid bath in deep shades but are also suitable for the dyeing of leather, furs, casein, superpolyamide and superpolyurethanefibres. If desired they can also be used for the dyeing of lacquers and cellulose spinning masses.

The following examples illustrate the invention. Where not otherwise stated, parts are given as parts by, weight and the temperatures are in degrees centigrade. The relationship of parts by weight to parts by volume is as that of kilogrammes to litres.

EXAMPLE 1 7 v 4 a 3.44 parts of the dyestufi from diazotised 4-nitro-6- chloro-Z-amino-l-hydroxybenzene and Z-hydroxynaphthalene and 4.97 parts of the disazo dyestuif from diazotised 3-hydroxy 4 amino-6-methyl-4'-chloro-1.1'-azobenzene- 3'-sulphonic acid and 2-hydroxynaphthalene are stirred in 200 parts by volume of water. At a solution of the sodium salt of disalicylato chrornic acid (corresponding to 0.6 part of chromium) is added, the reaction is made weakly phenolphthalein alkaline by the addition of sodium carbonate and the whole is boiled until the complex formation is complete. The chromium-containing dyestuif is isolated by the addition of sodium chloride. After drying, the dyestuff is a dark powder which dyes wool from a neutral or weakly'acid-bath in greenishblack shades which have good fastness properties.

If in the above example the monoazo dyestufi is replaced by 354 parts of the monoazo dyestutf from diaz'otised 4.6-dinitro- 2 amino-.l-hydroxybenzene and Z-hydroxynaphth'alene, then'a'dyestuff with similar properties is obtained.

The monoazo dyestutfs are obtained from l-hydroxy- 2-diazo-4-nitroor .-4.6-dinitrobenzene and the equivalent amount of Z-hydroxynapthalene, in an aqueous/ alkaline medium in the cold. The disazo dyestuif is obtained by coupling 1-diazo-4-chlorobenzene-3-sulphonic acid and the equivalent amount of 1-hydroxy-2-amino-4 methylbenzene dissolved in water, the chlorohydrate being obtained on acid reaction in the presence of sodiumthiosulphate in the cold, indirectly diazotising the arninoazo dyestuff obtained with sodium nitrite and hy drochloric acid in the cold and coupling with the equivalent amount of Z-hydroxynaphthalene in aqueous/caustic alkaline solution.

The mono and disazo dyestuffs used in the following examples and in the table are produced in an analogous manner.

EXAMPLE 2 3.09 parts of the dyestufit from 'diazotised 4-nitro-2- amino-lhydroxybenzene and 2-hydroxynaphthalene and 4.965 parts of the disazo dyestutf from diazotised 3-hydroxy 4 amino -6 methyl 4' chloro 1.1 azobenzene-3'-'sulphonic acid and 2-hydroxynaphthalene are stirred in'1-50 parts of water. Anaqueous, solution of the sodium salt of disalicylato chromic acid (corresponding to'0.57 part ofjchromium) are added and the whole is boiled until the complex formation is complete. The dyestuff is salted out, filteredotf anddried. It is a dark powder whichjdyes wool in olive-grey to black shades depending on the. strength. 7

meme

3.23 parts of the dyestuif from diazotised 4-nitro-6- methyI-Z-amino-l-hydroxybenzene and 2-hydroxynaphthalene and 4.97 parts of the disazo dyestuff from diazotised 3 hydroxy 4 amino -6 methyl 4' chloro 1.1- azobenzene-3'-sulphonic acid and 2-hydroxynaphthalene are stirred in 200 parts by volume of Water and the whole is boiled with a solution of the sodium salt of disalicylato chromic acid (corresponding to 0.6 part of chromium), until the metallisation is complete. The chromium-containing dyestufi is then precipitated by the addition of sodium chloride, filtered off and dried. It is a dark powder which dyes wool from a neutral or weakly acid bath in fast black shades.

If in the above example, the disazo dyestufi is replaced by 4.62 parts of the disazo dyestuff from diazotised 3- hydroxy 4 '-'amino 6 methyl 1.1 azobenzene 3'- sulphonic acid or 3-hydroxy-4-amino-6-methyl-l.l'-azobenzene-4'-sulphonic-acid and Z-hydroxynaphthalene, then dyestutfs with similar properties are obtained.

EXAMPLE 4 EH3 47.6 parts of the jdisazo dyestulf 1-aminobenzene-3-sulphonic acid- 2 methoxy methyl- 1 aminobenzene 2-hydroxynaphthaleneare stirred in200 parts by volume of formamide and 42 parts b y volume of glycol monomethyl ether. 4 parts of glacial acetic acid and 36 parts of chromic acetate (corresponding to 7.8 parts of chromium) are added and the whole is heated for 4% hours at 130-135. A deep green-blue solution is obtained which is poured at 5060 into a mixture of 850 parts by volume of 20% sodium chloride solution and 85 parts by volume of N-hydrochloric acid. The chromium-containing dyestuii precipitates. It is filtered off and washed with about 800 parts by volume of sodium chloride solution.

The damp, chromium-containing dye paste is then pasted with 29.6 parts of the monoazo dyestufi from stirred in 200 parts of water.

'- itis a: grey-black powder which dyes wool from an acetic acid bath in greenish-black shades.

EXAMPLE 5 3.66 parts of the monoazo dyestufi from diazotised 4- nitro-6-acetylamino-2-amino-l-hydroxybenzene and 2-hydroxynaphthalene and 4.62 parts of the disazo dyestufi from diazotised 3-hydroxy-4-amino-6-methyl-1.1-azobenzene-4-sulphonic acid and Z-hydroxynaphthalene are A solution of the sodium salt of disalicylato chromic acid (corresponding to 0.6 part of chromium) is added at 85, the reaction is made weakly phenolphthalein alkaline by the addition of anhydrous sodium carbonate and the whole is boiled until the complex formation is complete. The "chromium-containing dyestuff is salted out with sodium chloride, filtered ofl? and dried. It is a dark powder which dyes wool in black shades which have good fastness properties.

The following table contains further dyestufis accordiug'torthe present invention which are obtained by themethods described in the above examples.

Table No. monoazo dye dlsazo dye Dyeing m on wool 1...". 3.44pts.6-chloo;4.-nitro 4.62 pts. 3-hydroxy-4- black.

2-amino-1-hydroxyamino-6-methy1-1.l-

"b'efizene 2-hy- 'a'zobenzeneW-sulphonic dro xynaphthalene. acid 2-hydroxy- A naphthalene. 2 do..-. 4.62 pts. -3-hydroxy-4- D I amino-G-methyl-1.l-

- azohenzene-4'-sulphonlc acid 2-hydroxynaphthalene.

3.....- 3.54 pts. .4.fi=dlnitro.-2- do;..... Do,

aminoql-hydroxybenzene 2-hydroxynaphthelene. 4..--.. do 4.62 pts. 3-hydroxy-4- D0 amino-6-n1ethyl-1.1-

az0benzene-3-sulphonic 5... 3.09pts.4-nitro-2-amlno- 4.62 pts. 3-hydroxy-4- Do.

l-nydroxybenzene amlno-fi-methyl ll'l 2-hydroxyazobenzene-4-su.lphonic naphthalene. acid 2-hyd1oxynaphthalene.

6 do 4.9 pts. 3-hydroxy-4- D amino-6.4.6trimethyl- 1.1 azobenzene 2 sulhonic acid 2- ydroxyna hthalene.

7 3.66pts.4-nttro-6-acetyl- 4.97 pts. 3- ydroxy-4- Do.

amino-Z-aminO-l-hyamino 6 methyl 4 droxybenzene chloro-1.1-azobenzene- Z-hydroxynaphtha- 3-sulphonic acid lene. 2-hydroxynaphthalene.

8...... do 4.62 pts. 3-hydroxy-4- 'Do.

am1no-6-methyl-1.1'- azobenzene-3-sulphonlo acid 2-hydroxynaphthalene.

diazotised 4-nitro-2-amino-1-hydroxybenzene and 2-hy- .to the formula V wea 7 EXAMPLB- 0.4 m of the metal-containing dyesnfi seeming ref Example 2 are dissolved in 400 parts by volume of Water;

10 parts of previously Well wetted wool are enteredat- 50, 0.5 part of ammonium acetateare added and the bath is brought to the boil withinv45 minutes. Dyeing is performed at the boil while moving the goods well for 1 /2 hours whereupon the wool is rinsed and dried. The wool which has been dyed black is distinguished by good fastness properties.

Dyeing can be performed with the other dyestuffs mentioned'in the examples and in the table in an analogous manner. Very fast black wool dyeings are also obtained. This application is a continuation-in-part of application Serial No. 6351384,. filed January 22, 1957.

What we claim is: 1. A complex chromium compound corresponding to wherein:

X is a member selected from the group consisting. of. H,,C1,

CH ,NO acety1amino, and

Y is a member selected from the group consisting of H, CH and Cl,

n is a whole number from 1 to 2.

2 The complex chromium compound corresponding '3. The complex chromium compound corresponding to the formula I 6 r l 0 \Cr,/ 7 f V CH3 0 I o SIOQH (5H: 7

4. The complex chromium compound corresponding to the formula 5. The complex chromium compound corresponding to the formula SOaH CHe 6. The complex chromium compound corresponding to the formula o References-Cited in' the file: ofthis' patent UNITED STATES PATENTS r 2,775358l Neier et: al. Dec. 25,1956 

1. A COMPLEX CHROMIUM COMPOUND CORRESPONDING TO THE GENERAL FORMULA 